Deductions & credits

For 2017 the standard deduction amounts are:
Single 6,350 + 1,550 for 65 and over
HOH 9,350 + 1,550 for 65 and over
Joint 12,700 + 1,250 for each 65 and over
Married filing Separate 6,350 + 1,550 for 65 and over

So for Joint with both spouses 65+ would be 12,700+1,250+1,250 = 15,200